Alemu, Muluken (2015) Ower Distribution Network Reconfiguration Using a Heirustic Method (Case Study: Addis Ababa City Distribution Network). Masters thesis, Addis Ababa University.
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Abstract
Electric distribution systems consist of tie and sectionalizing switches. Tie switches are normally open and sectionalizing switches are normally closed. By opening and closing these switches the distribution network can be reconfigured. This reconfiguration can be done for the objective of loss minimization, load balancing etc. In order to get feasible results the reconfiguration must meet some constraints, like Kirchhoff’s voltage and current laws, other equality and inequality constraints. Distribution network reconfiguration is an optimization problem and needs a suitable algorithm (method).The method used for this optimization problem is a heuristic optimization method (algorithm). The heuristic algorithm will be described in detail and then applied specifically to the network reconfiguration problem. In the optimization process load flow of the distribution system should be computed. For this purpose and simulation of the distribution network PSS/E software, developed by Siemens PTI, is used. PSS/E software is a powerful commercial program which converges for solving distribution system load flows in microseconds even though it uses full Newton-Raphson method. The test system and on which the case study is done, is a practical large Addis Ababa MV distribution network. This network is simulated and reconfiguration is done by the heuristic method which is described in the thesis. After reconfiguration for loss minimization, the power losses decreased from 1379.5KW to 416.9 KW, which is 69.78% reduction. Also after reconfiguration for load balancing, system load balancing index decreased from 100.9 % to 35.05 %, which is 65.26 % reduction, which means protective system tripping of the distribution network is decreased. Finally conclusions are made on reconfiguration of the distribution feeder. Also recommendations are made for Ethiopian Electric Utility how to reconfigure their distribution system and be able to reduce the losses, improve voltage profiles and ultimately solve the common power interruptions in Addis Ababa.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Heuristics optimization technique, switch allocation, electric power distribution networks, reconfiguration, loss reduction, load balancing. |
| Subjects: | Q Science > Q Science (General) Q Science > QA Mathematics > QA75 Electronic computers. Computer science T Technology > T Technology (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Divisions: | Africana |
| Depositing User: | Andriamparany Edilbert RANOARIVONY |
| Date Deposited: | 12 Jul 2018 07:13 |
| Last Modified: | 12 Jul 2018 07:13 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/7341 |
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